package com.xuecheng.learning.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.xuecheng.base.exception.XueChengPlusException;
import com.xuecheng.base.model.PageResult;
import com.xuecheng.content.model.po.CoursePublish;
import com.xuecheng.learning.feignclient.ContentServiceClient;
import com.xuecheng.learning.mapper.XcChooseCourseMapper;
import com.xuecheng.learning.mapper.XcCourseTablesMapper;
import com.xuecheng.learning.model.dto.MyCourseTableParams;
import com.xuecheng.learning.model.dto.XcChooseCourseDto;
import com.xuecheng.learning.model.dto.XcCourseTablesDto;
import com.xuecheng.learning.model.po.XcChooseCourse;
import com.xuecheng.learning.model.po.XcCourseTables;
import com.xuecheng.learning.service.MyCourseTablesService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 选课实现业务层
 */

@Slf4j
@Service
public class MyCourseTablesServiceImpl implements MyCourseTablesService {

    @Autowired
    XcChooseCourseMapper xcChooseCourseMapper;

    @Autowired
    XcCourseTablesMapper xcCourseTablesMapper;

    @Autowired
    ContentServiceClient contentServiceClient;

    @Autowired
    MyCourseTablesService myCourseTablesService;

    @Autowired
    MyCourseTablesServiceImpl currentProxy;


    /**
     * 本接口支持免费课程选课、收费课程选课。
     * 免费课程选课：添加选课记录、添加我的课程表。
     * 收费课程选课：添加选课记录。
     */
    @Override
    public XcChooseCourseDto addChooseCourse(String userId, Long courseId) {

        //查询课程信息 调用client
        CoursePublish coursepublish = contentServiceClient.getCoursepublish(courseId);
        //收费规则 规则：收费、免费
        String charge = coursepublish.getCharge();
        //选课记录
        XcChooseCourse chooseCourse = null;
        if ("201000".equals(charge)) {
            //免费
            //新增选课记录表
            chooseCourse = addFreeCoruse(userId, coursepublish);
            //添加到我的课程表
            XcCourseTables xcCourseTables = addCourseTabls(chooseCourse);
        } else {
            //收费
            //添加收费课程
            chooseCourse = addChargeCoruse(userId, coursepublish);
        }
        //查询学习资格
        XcChooseCourseDto xcChooseCourseDto = new XcChooseCourseDto();
        BeanUtils.copyProperties(chooseCourse, xcChooseCourseDto);
        //获取学习资格
        XcCourseTablesDto xcCourseTablesDto = getLearningStatus(userId, courseId);
        xcChooseCourseDto.setLearnStatus(xcCourseTablesDto.getLearnStatus());
        return xcChooseCourseDto;
    }

    /**
     * 查询学习资格状态   查询我的课程表的时间校验
     *
     * @param userId
     * @param courseId
     * @return
     */
    @Override
    public XcCourseTablesDto getLearningStatus(String userId, Long courseId) {
        //查询我的课程表
        XcCourseTables xcCourseTables = getXcCourseTables(userId, courseId);
        if (xcCourseTables == null) {
            XcCourseTablesDto xcCourseTablesDto = new XcCourseTablesDto();
            //没有选课或选课后没有支付
            xcCourseTablesDto.setLearnStatus("702002");
            return xcCourseTablesDto;
        }
        XcCourseTablesDto xcCourseTablesDto = new XcCourseTablesDto();
        BeanUtils.copyProperties(xcCourseTables, xcCourseTablesDto);
        //是否过期,true过期，false未过期
        boolean isExpires = xcCourseTables.getValidtimeEnd().isBefore(LocalDateTime.now());
        if (!isExpires) {
            //正常学习
            xcCourseTablesDto.setLearnStatus("702001");
            return xcCourseTablesDto;

        } else {
            //已过期
            xcCourseTablesDto.setLearnStatus("702003");
            return xcCourseTablesDto;
        }
    }

    @Override
    public boolean saveChooseCourseSuccess(String chooseCourseId) {
        //根据选课id查询选课表
        XcChooseCourse chooseCourse = xcChooseCourseMapper.selectById(chooseCourseId);
        if (chooseCourse == null) {
            log.debug("接收购买课程的消息，根据选课id从数据库找不到选课记录,选课id:{}", chooseCourseId);
            return false;
        }
        //选课状态
        String status = chooseCourse.getStatus();
        //只有当未支付时才更新为已支付
        if ("701002".equals(status)) {
            //更新选课记录的状态为支付成功
            chooseCourse.setStatus("701001");
            int i = xcChooseCourseMapper.updateById(chooseCourse);
            if (i <= 0) {
                log.debug("添加选课记录失败:{}", chooseCourse);
                XueChengPlusException.cast("添加选课记录失败");
            }

            //向我的课程表插入记录
            XcCourseTables xcCourseTables = addCourseTabls(chooseCourse);
            return true;
        }
        return false;
    }

    /**
     * 添加收费课程
     *
     * @param userId
     * @param coursepublish
     * @return
     */
    private XcChooseCourse addChargeCoruse(String userId, CoursePublish coursepublish) {

        //如果存在待支付交易记录直接返回
        LambdaQueryWrapper<XcChooseCourse> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper = queryWrapper.eq(XcChooseCourse::getUserId, userId)
                .eq(XcChooseCourse::getCourseId, coursepublish.getId())
                .eq(XcChooseCourse::getOrderType, "700002")//收费订单
                .eq(XcChooseCourse::getStatus, "701002");//待支付
        List<XcChooseCourse> xcChooseCourses = xcChooseCourseMapper.selectList(queryWrapper);
        if (xcChooseCourses != null && xcChooseCourses.size() > 0) {
            return xcChooseCourses.get(0);
        }
        XcChooseCourse xcChooseCourse = new XcChooseCourse();
        xcChooseCourse.setCourseId(coursepublish.getId());
        xcChooseCourse.setCourseName(coursepublish.getName());
        xcChooseCourse.setCoursePrice(coursepublish.getPrice());
        xcChooseCourse.setUserId(userId);
        xcChooseCourse.setCompanyId(coursepublish.getCompanyId());
        xcChooseCourse.setOrderType("700002");//收费课程
        xcChooseCourse.setCreateDate(LocalDateTime.now());
        xcChooseCourse.setStatus("701002");//待支付

        xcChooseCourse.setValidDays(coursepublish.getValidDays());
        xcChooseCourse.setValidtimeStart(LocalDateTime.now());
        xcChooseCourse.setValidtimeEnd(LocalDateTime.now().plusDays(coursepublish.getValidDays()));
        xcChooseCourseMapper.insert(xcChooseCourse);
        return xcChooseCourse;


    }

    /**
     * 添加到我的课程表
     *
     * @param xcChooseCourse
     * @return
     */
    private XcCourseTables addCourseTabls(XcChooseCourse xcChooseCourse) {
        //选课记录完成且未过期可以添加课程到课程表
        String status = xcChooseCourse.getStatus();
        if (!"701001".equals(status)) {
            XueChengPlusException.cast("选课未成功，无法添加到课程表");
        }
        //查询我的课程表
        XcCourseTables xcCourseTables = getXcCourseTables(xcChooseCourse.getUserId(), xcChooseCourse.getCourseId());
        if (xcCourseTables != null) {
            return xcCourseTables;
        }
        XcCourseTables xcCourseTablesNew = new XcCourseTables();
        xcCourseTablesNew.setChooseCourseId(xcChooseCourse.getId());
        xcCourseTablesNew.setUserId(xcChooseCourse.getUserId());
        xcCourseTablesNew.setCourseId(xcChooseCourse.getCourseId());
        xcCourseTablesNew.setCompanyId(xcChooseCourse.getCompanyId());
        xcCourseTablesNew.setCourseName(xcChooseCourse.getCourseName());
        xcCourseTablesNew.setCreateDate(LocalDateTime.now());
        xcCourseTablesNew.setValidtimeStart(xcChooseCourse.getValidtimeStart());
        xcCourseTablesNew.setValidtimeEnd(xcChooseCourse.getValidtimeEnd());
        xcCourseTablesNew.setCourseType(xcChooseCourse.getOrderType());
        xcCourseTablesMapper.insert(xcCourseTablesNew);

        return xcCourseTablesNew;
    }


    /**
     * 根据课程和用户查询我的课程表中某一门课程
     *
     * @param userId
     * @param courseId
     * @return
     */
    private XcCourseTables getXcCourseTables(String userId, Long courseId) {
        XcCourseTables xcCourseTables = xcCourseTablesMapper.selectOne(new LambdaQueryWrapper<XcCourseTables>().eq(XcCourseTables::getUserId, userId).eq(XcCourseTables::getCourseId, courseId));
        return xcCourseTables;
    }

    /**
     * 添加免费课程到记录表、添加到我的课程表
     *
     * @param userId
     * @param coursepublish
     * @return
     */
    private XcChooseCourse addFreeCoruse(String userId, CoursePublish coursepublish) {
        //查询选课记录表是否存在免费的且选课成功的订单    //存在直接返回   不存在，组装参数新增
        LambdaQueryWrapper<XcChooseCourse> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper = queryWrapper.eq(XcChooseCourse::getUserId, userId)
                .eq(XcChooseCourse::getCourseId, coursepublish.getId())
                .eq(XcChooseCourse::getOrderType, "700001")//免费课程
                .eq(XcChooseCourse::getStatus, "701001");//选课成功
        List<XcChooseCourse> xcChooseCourses = xcChooseCourseMapper.selectList(queryWrapper);
        if (xcChooseCourses != null && xcChooseCourses.size() > 0) {
            return xcChooseCourses.get(0);
        }
        //添加选课记录信息
        XcChooseCourse xcChooseCourse = new XcChooseCourse();
        xcChooseCourse.setCourseId(coursepublish.getId());
        xcChooseCourse.setCourseName(coursepublish.getName());
        xcChooseCourse.setCoursePrice(0f);//免费课程价格为0
        xcChooseCourse.setUserId(userId);
        xcChooseCourse.setCompanyId(coursepublish.getCompanyId());
        xcChooseCourse.setOrderType("700001");//免费课程
        xcChooseCourse.setCreateDate(LocalDateTime.now());
        xcChooseCourse.setStatus("701001");//选课成功

        xcChooseCourse.setValidDays(365);//免费课程默认365
        xcChooseCourse.setValidtimeStart(LocalDateTime.now());
        xcChooseCourse.setValidtimeEnd(LocalDateTime.now().plusDays(365));
        xcChooseCourseMapper.insert(xcChooseCourse);

        return xcChooseCourse;

    }


    @Override
    public PageResult<XcCourseTables> mycoursetables(MyCourseTableParams params) {
        //用户id
        String userId = params.getUserId();
        //当前页码
        int pageNo = params.getPage();
        //每页记录数
        int size = params.getSize();

        Page<XcCourseTables> courseTablesPage = new Page<>(pageNo, size);
        LambdaQueryWrapper<XcCourseTables> lambdaQueryWrapper = new LambdaQueryWrapper<XcCourseTables>().eq(XcCourseTables::getUserId, userId);

        //查询数据
        Page<XcCourseTables> result = xcCourseTablesMapper.selectPage(courseTablesPage, lambdaQueryWrapper);

        //数据列表
        List<XcCourseTables> records = result.getRecords();
        //总记录数
        long total = result.getTotal();

        //List<T> items, long counts, long page, long pageSize
        PageResult pageResult = new PageResult(records, total, pageNo, size);

        return pageResult;
    }

}
